Delete row sig_99b32b4ade9e from signals

id sig_99b32b4ade9e
event_id evt_9c5fb0c7ae83
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5288421 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-19T03:23:55Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-22T03:23:55.136990+00:00
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